<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<h5>hello,家人们</h5>
<h5>msg:${msg}</h5>
<!--表达式，此时变成字符创类型-->
<h5>f1:${f1?c}</h5>
<!--相当于三元运算符，针对类型转换-->
<h5>f1:${f1?then('yes','no')}</h5>
<!--时间类型-->
<h5>d1:${d1?datetime}</h5>
<h5>testRequest获取值:<#if testRequest??>${testRequest}</#if></h5>
<h5>session获取值:<#if sessionId??>${sessionId}</#if></h5>
<h5>applicationCode获取值:<#if applicationCode??>${applicationCode}</#if></h5>
<h5>cookName取值:<#if cookName??>${cookName}</#if></h5>
</body>
</html>